What’s Vulnerable › Vulnerabilities

CVE-2023-2236: Use-after-free in Linux kernel's Performance Events subsystem

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-01 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability. We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

Affected products

• Linux kernel: from 5.19 before 6.0.11 — fixed in 6.0.11
• NetApp Hci Baseboard Management Controller: h300s, h410c, h410s, h500s, h700s

How to fix

Upgrade to a fixed version: Linux kernel 6.0.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4
• https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4
• https://security.netapp.com/advisory/ntap-20230601-0010/
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4
• https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4
• https://security.netapp.com/advisory/ntap-20230601-0010/

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